The assessee has purchased 1000 shares of company A in 2010. The company got demerged in 2023 and 1000 shares of company B(demerged entity) were issued. The assessee sold shares of company B in FY 2023-24 resulting in long term capital gain on listed equity shares. What would be fair market value of shares of company B as it was not listed separately before 31/01/2018? FMV of original company is to be taken as a whole or as per the demerger ration of original company and demerged company?